Boiler-tube cutter.



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DAVID E. DAVIS, OF MILIVAUKEE, VISCONSIN7 ASSIGNOR OF ONE-HALF TO WALLACE C. DAVIS, OF SAME` PLACE.

BOlLER-TUBE CUTTER.

SPEGIFCATION *forming` part of Letters Patent No. 662,893, dated November 27, 1900.

Application filed March l5, 1900. Serial No. 8,763. LNo model.)

/I'G all wh/0771, it may cm2/cern:

Bc it known that I, DAVID E. Davis, acitizen of the United States, residing at Milwauhee7 county of Milwaukee, and State of Wiscousin, have invented new and useful Improveniente in Boiler-Tube Cutters, of which the following is a specification.

My invention relates to improvements in boiler-tube cutters; and it pertains to that Io class which are adapted to cut a tube from its interior outwardly. With this class of tubecutters as. heretofore constructed it has been difficult, to retain them in a fixed position within the tube with sufficient rigidity to form i5 a smooth uniform out at right angles to the axis of the tube. By my improvement the cutting-tool holder proper is now provided with acylindrical extension-sleeve of greater or less length, according to the diameter of 2o the tube to be cut, which extension-sleeve is of nearlyequal diametertothatof the boilertube and is caused by the lateral pressure of the operator upon the cutter-shank when revolving it to impinge against the interior walls of the tube, whereby the tool is held in place with sufiicient rigidity to produce the desired cut.

My improvement pertains, further, to the shape of the cutting-tool and the mechanism 3o for feeding the sam-e.

My invention is further explained by reference to the accompanying drawings, in which- Figure 1 represent-s a side view. Fig. 2

representsalongitudinal section.- Fig. 3 represents a front View of the cutting-tool.

Like parts are referred to by the same reference-letters throughout the several views.

l am aware that a tu be-cutter consisting of 4o a cutting-tool A, tool-supporting` sleeve B, provided with transverse apertures Cforthe reception of said tool A, operating-shank D, provided with eccentric-pin E, operating in the slot F of said cutting-tool A, adjustable 4g collar G, serrated feed-collar I-I, and bearingspring I has previously been used, and I therefore do not claim4 such parts as my invention.

ly my improvement a revoluble sleeve J :o is secured to the periphery of the sleeve B upon a central trunnion K. rIhc trunnion K is secured to the sleeve B by a threaded joint L. The trunnion K is provided with a radial ange M, which retains the sleeve J in place, thus forming an extension which when in use is held in place within the tube to be cut. rlhe so-called extension refers to all that part of the tool at the left of the sleeve B in Figs. 1 and 2. By this arrangement the friction of the tool-support- 6o ing sleeve heretofore used against the interior wall of the tube is avoided` as the revolving sleeve B is prevented from coming in contact with the interior of the. pipe, and as the contiguous surfaces of the sleeve .I and trunnion K may be kept lubricated the friction of turning the sleeve B is diminished, and the labor of operating the tool is very much reduced. It is also obvious that by inserting ball-bearings N between the 7o sleeve .I and its supporting-beatiugs, as indicated in Fig. 2, the friction of such parts may be almost entirely overcome, when, owing to the length of such extension-bearings, the cutting-tool will be held rigidly in place. It is a well-known fact that when securing the boiler-tubes in place it often becomes neeessaryto cut the ends of some of the tubes which protrude through the boiler-head, in which case it is important to sever the tube 8o at a uniform distance from the head with a smooth uniform cut. To accomplish this object, I have provided, in addition to the adjust-able collar G, a gage O, which is secured to the adjustable collar G bya screw-threaded ring P. The gage O and collar G are simultaneously adjusted upon the sleeve B by the set-screw Q at intervals corresponding with the indentations R formed in the sleeve B, whereby when said gage is broughtagainst 9o the head of the boiler, as indicated in Fig. 2, the cutting-tool A may be adjusted and retained at any desired point within the tube to be cut and the same severed with a smooth cut at a uniform distance from said head.

The teeth of the serrated feed-collar I-I'are held in contact with the opposing teeth of the tool by the spiral spring I, and the tension of the spiral spring I against said feed-collar is increased or diminished by the hand-nut S, roo which has screw-threaded bearings upon the shank D. It will be obvious that by this arrangement the cutting-tool A is forced outwardly and into the walls of the tube to be cut by the movement of the eccentric-pin E as the shank D is turned forward and that when thus forced into the wall of the tube to be cut it is driven in a circular course in contact with the wall ot' the tube by rotating the shank D and sleeve B together. Motion is communicated from the shank D to the sleeve B through the serrated edges of said feedcollar and tool, as will be understood. The edge of the cutting-tool A is made of a uniform circular shape on each side of a line drawn through its longitudinal axis, whereby when one corner becomes dull the tool may by turned over and the opposite corner used.

In operating my device it becomes necessary with each revolution of the cutting-tool to pull back the feed-collar and adjust it one tooth in advance, whereby the eccentric-pin E is rotated and the cutting-tool is driven farther into the tube to be cut. Owing to this fact it becomes necessary to procure a nice adjustment ot' said spring I, which is accomplished by substituting the adjustable handnut S for the stationary or `fixed collar heretofore used.

Having thus described my in vention,what I claim as new,and desire to secure by Letters Patent, is

1. In a boiler-tube cutter, the combination with the supporting-sleeve B of the cuttingtool; and the operating-shank D, of a separate extension bearing or trunnion K removably affixed to said tool-supporting sleeve; and a removable extension-sleeve J, supported by and upon said trunnion, substantially as and for the purpose specified.

2. In a boiler-tube cutter, the combination with a tool-supporting sleeve B, and an op.-

eratin g-shank D,ot a separate extension bearing or trunnion K connected at one end by screw-threaded joint to said tube-supporting sleeve; an extension-sleeve .I supported by and upon said trunnion and one or more series of ballbearings, interposed between said trunnion and said sleeve, substantially as and for the purpose specified.

3. In a boiler-tube cutter, the combination with a tool-supporting sleeve and 'an operating-shank, of an extension-bearing, consisting of a trunnion rigidly affixed to said supporting-sleeve; and an inclosing sleeve supported upon said trunnion; and a screwthreaded gage-collar adjustably secured by screw threads to a corresponding thread formed upon the periphery of said tool-supporting sleeve, substantially as and for the purpose specified.

4;. In a boiler-tube cutter, the combination with a tool-supporting sleeve; an operatingshank; a trunnion rigidly affixed to said toolsupporting sleeve; a revoluble sleeve supported by and upon said trunnion; a gage-collar adjustably secured to said tool-supporting sleeve; a serrated feed-collar, the teeth of which are adapted to mesh with corresponding teeth formed in one end of said tool-supporting sleeve; an adjustable hand-nut having screw-threaded bearings on the operatingshank; and a tension-spring interposed between sad hand-nut and the opposing end of said feed-collar, all sustantially as and for the purpose specified.

In testimony whereof I affix my signature in the presence of two witnesses.

DAVID E. DAVIS.

Witnesses:

H. L. MARKHAM, B. RHODE. 

